September Classic Races within 50 miles of Thornton, CO on Weekends
Evergreen, CO
Bergen Peak Half Marathon
Sep 14, 2024
Longmont, CO
Colorado Brewery Running Series
Sep 15, 2024
Thornton, CO
RMRR Fall Marathon Training Series
Aug 25, 2024
Sep 22, 2024
Sep 8, 2024
RMRR Trophy Series - September
Sep 8, 2024
Greeley, CO
Superhero Event
Sep 21, 2024
Denver, CO
Sentir Venezolano 5K Walk / Run
Sep 17, 2023
Denver Broncos 7K
Sep 1, 2024
Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
Sep 7, 2024
9/11 Heroes Run
Sep 8, 2024
Denver Rocks Run 5K/10K
Sep 8, 2024
Healthy Kids Running Series
Sep 8, 2024
Sep 15, 2024
Sep 29, 2024
Oct 6, 2024
1 more
Colorado Brewery Running Series
Sep 14, 2024
Denver 5K
Sep 14, 2024
Heroes and Villains Team Hope 5K Walk and Run
Sep 14, 2024
Nun Run
Sep 15, 2024
Move Forward 5K & 10K
Sep 21, 2024
RiNo 5K
Sep 21, 2024
Roadrunners 5K
Sep 28, 2024
Aurora, CO
Healthy Kids Running Series
Aug 25, 2024
Sep 22, 2024
Sep 8, 2024
Sep 29, 2024
1 more
RexRun For PAWSitivity 5K Trail Run/Walk
Sep 7, 2024
OCA Panda Run
Sep 21, 2024
EDT XC Showdown
Sep 22, 2024
Georgetown, CO
Colorado Brewery Running Series
Sep 28, 2024
Parker, CO
So Long to Summer 5K
Sep 21, 2024
Winter Park, CO
Elevation Everest - The Half Everest
Sep 28, 2024
Louisville, CO
Louisville Trail Race
Sep 28, 2024
Nederland, CO
Ned Ned Run
Sep 14, 2024
Highlands Ranch, CO
BackCountry 5K
Sep 15, 2024
Littleton, CO
Lookin For A Cure Denver
Sep 23, 2023
Firestorm 5K
Sep 7, 2024
Colorado Dup15q Believe Walk and 5K Run
Sep 14, 2024
HRCA Oktoberfest 5K
Sep 14, 2024
Flyin' Lion 5K
Sep 15, 2024
Miles 4 Madison 5K
Sep 21, 2024
Vitality Octa-Strong 5K
Sep 21, 2024
Second Wind Walk/Run
Sep 22, 2024
HRCA Wildcat Mountain Trail Races
Sep 28, 2024
Arvada, CO
Forge 5K
Sep 30, 2023
Lisa Nelson's Mustang Stampede
Sep 21, 2024
Run With The Wolves
Sep 29, 2024
Estes Park, CO
Rut Run 5K
Sep 28, 2024
Boulder, CO
South Boulder Creek parkrun
Mar 22, 2025
Mar 29, 2025
Apr 5, 2025
Apr 12, 2025
48 more
The Day Quest - The Edge of Ultra - 26.3
Sep 1, 2024
Friends of the National Center Science Stride 5K
Sep 14, 2024
Avery Brewing Company Oktoberfest 4K
Sep 22, 2024
CASA 5K
Sep 28, 2024
Boulderthon: Downtown Boulder Marathon
Sep 29, 2024
Lafayette, CO
Waneka Classic
Sep 7, 2024
Morrison, CO
RRCC Front Nine 5K
Sep 15, 2024
Wheat Ridge, CO
Farmers 5000
Sep 15, 2024
Windsor, CO
Windsor Wiesn Mile and 5 Mile
Sep 23, 2023
Lakewood, CO
Tiger Prowl
Sep 15, 2024
Bear Chase Race - Half Marathon & 10K
Sep 29, 2024
Sep 28, 2024
Commerce City, CO
Night Nation Run - Denver
Sep 28, 2024
Empire, CO
Devil on the Divide
Sep 7, 2024
Elizabeth, CO
Historic Elizabeth Main Street 5K
Sep 7, 2024
Fort Collins, CO
Recovery Run of the Rockies 5K
Sep 1, 2024
Healthy Kids Running Series
Sep 7, 2024
Sep 14, 2024
Sep 28, 2024
Oct 5, 2024
1 more
Liberty-2-Liberty 5K
Sep 21, 2024
Fall Equinox Marathon
Sep 22, 2024
Mustang Music 5K
Sep 28, 2024
Niwot, CO
St. Vrain for the Brain 5K
Sep 21, 2024
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Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
1. Calarat Challenge Trail Running Festival
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Sep 1, 2024Sunday
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13.1M, 10K trail run
More Information
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Jamestown, CO
28 miles point to pointBoulder County, CO
2. Denver Broncos 7K
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Sep 1, 2024Sunday
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7K run | kids run
More Information
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Denver, CO
9 miles point to pointDenver County, CO
3. Recovery Run of the Rockies 5K
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Sep 1, 2024Sunday
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5K run
More Information
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Fort Collins, CO
50 miles point to pointLarimer County, CO
4. The Day Quest - The Edge of Ultra - 26.3
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Sep 1, 2024Sunday
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26.2M run | 26.3M trail run
More Information
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Boulder, CO
19 miles point to pointBoulder County, CO
5. Devil on the Divide
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Sep 7, 2024Saturday
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50K, 22K trail run
More Information
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Empire, CO
38 miles point to pointClear Creek County, CO
6. Firestorm 5K
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Sep 7, 2024Saturday
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5K run
More Information
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Littleton, CO
18 miles point to pointArapahoe County, CO
7. Healthy Kids Running Series - Fort Collins
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Sep 7, 2024Saturday
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kids run
More Information
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Fort Collins, CO
50 miles point to pointLarimer County, CO
8. Historic Elizabeth Main Street 5K
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Sep 7, 2024Saturday
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5K run | novelty run
More Information
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Elizabeth, CO
40 miles point to pointElbert County, CO
9. RexRun For PAWSitivity 5K Trail Run/Walk
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Sep 7, 2024Saturday
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5K trail run | kids run
Virtual OptionMore Information
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Aurora, CO
12 miles point to pointArapahoe County, CO
10. Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
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Sep 7, 2024Saturday
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26.2M, 13.1M run
More Information
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Denver, CO
9 miles point to pointDenver County, CO
11. South Boulder Creek parkrun
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Sep 7, 2024Saturday
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5K run
More Information
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Boulder, CO
19 miles point to pointBoulder County, CO
12. Waneka Classic
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Sep 7, 2024Saturday
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5K run
More Information
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Lafayette, CO
11 miles point to pointBoulder County, CO
13. 9/11 Heroes Run - Denver
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Sep 8, 2024Sunday
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5K run
More Information
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Denver, CO
9 miles point to pointDenver County, CO
14. Denver HOPErun
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Sep 8, 2024Sunday
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5K run
More Information
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Golden, CO
15 miles point to pointJefferson County, CO
15. Denver Rocks Run 5K/10K
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Sep 8, 2024Sunday
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10K, 5K run
More Information
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Denver, CO
9 miles point to pointDenver County, CO
16. Healthy Kids Running Series - Denver
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Sep 8, 2024Sunday
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kids run
More Information
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Denver, CO
9 miles point to pointDenver County, CO
17. Healthy Kids Running Series - Aurora
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Sep 8, 2024Sunday
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kids run
More Information
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Aurora, CO
12 miles point to pointArapahoe County, CO
18. Healthy Kids Running Series - Erie
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Sep 8, 2024Sunday
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kids run
More Information
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Erie, CO
13 miles point to pointWeld County, CO
19. Honey Bee Hustle
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Sep 8, 2024Sunday
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1.5H run
More Information
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Loveland, CO
37 miles point to pointLarimer County, CO
20. RMRR Fall Marathon Training Series
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Sep 8, 2024Sunday
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30K, 20K run
More Information
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Thornton, CO
Adams County, CO
For the love of all that Is good And moisture wicking...
Though we Try To be accurate And On top Of things... Race details can change When we aren't lookin. And once in a while we simply make a mistake.
ALWAYS visit the race's website for the most complete and accurate race information.
ALWAYS visit the race's website for the most complete and accurate race information.